Ask your school to calculate an estimated rank based on the ranks of last year's 1L class. That should be enough for any school you are applying to. Along with the estimated rank, you can get a letter from the registrar indicating that official ranks don't come out until ____ date. With the estimated rank, there should be no hold up in the processing of your transfer apps unless a particular school is really picky about that sort of thing. Back when I applied to transfer, every school was just fine with using the estimated rank.
The grading policy, mean, std. deviation. etc. is too much info for admissions staff and they simply won't be able to accurately deduce your rank for that. These people aren't statisticians, and they make decisions whether to admit or deny a transfer fairly mechanically based on whatever parameters they decide to set.